由于在(zai)(zai)戶(hu)(hu)外(wai)(wai)、室(shi)內(nei)等區域，無(wu)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統的信(xin)(xin)(xin)號(hao)強度較弱，而且采用(yong)(yong)頻(pin)率調制技術（如(ru) MHZ、 NMR、 BSI等）產生的信(xin)(xin)(xin)號(hao)傳(chuan)輸(shu)時(shi)延(yan)大，傳(chuan)輸(shu)距離遠。因(yin)(yin)此有(you)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統不適合(he)在(zai)(zai)戶(hu)(hu)外(wai)(wai)環(huan)境(jing)(jing)使(shi)(shi)(shi)用(yong)(yong)，特別是在(zai)(zai)冬天及低風速季節使(shi)(shi)(shi)用(yong)(yong)。雖然無(wu)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統也有(you)著不錯的效果。但由于系(xi)統工作時(shi)會有(you)一定的干擾，使(shi)(shi)(shi)對講(jiang)(jiang)(jiang)效果下降，另外(wai)(wai)在(zai)(zai)信(xin)(xin)(xin)號(hao)較弱時(shi)對用(yong)(yong)戶(hu)(hu)語(yu)音產生了(le)影(ying)響。特別是在(zai)(zai)人員(yuan)復雜(za)、通信(xin)(xin)(xin)距離較短或需(xu)要(yao)(yao)(yao)較長時(shi)間(jian)使(shi)(shi)(shi)用(yong)(yong)時(shi)。因(yin)(yin)此，更需(xu)要(yao)(yao)(yao)有(you)一個可(ke)靠的無(wu)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統提供與有(you)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統一樣的語(yu)音信(xin)(xin)(xin)息與控(kong)制。無(wu)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統具有(you)很高(gao)的靈(ling)活性(xing)，它(ta)能夠(gou)滿足現(xian)場中(zhong)所有(you)環(huan)境(jing)(jing)使(shi)(shi)(shi)用(yong)(yong)需(xu)求并能隨(sui)(sui)時(shi)切換（如(ru)在(zai)(zai)野外(wai)(wai)、戶(hu)(hu)外(wai)(wai)電話等),用(yong)(yong)戶(hu)(hu)可(ke)以在(zai)(zai)任何地點使(shi)(shi)(shi)用(yong)(yong)、隨(sui)(sui)時(shi)、隨(sui)(sui)地進行(xing)通訊。使(shi)(shi)(shi)用(yong)(yong)方便、節省成本、節約費用(yong)(yong)。下面我們(men)來(lai)了(le)解(jie)一下無(wu)線(xian)(xian)對講(jiang)(jiang)(jiang)系(xi)統它(ta)主(zhu)要(yao)(yao)(yao)是什么優點？

1.性能穩(wen)定，可(ke)靠性高

在相同無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)(shu)距離下(xia)，無(wu)(wu)線(xian)(xian)(xian)傳輸(shu)(shu)信(xin)(xin)號(hao)(hao)(hao)更穩(wen)(wen)定(ding)由(you)于使(shi)用了功率放(fang)大(da)器來(lai)對(dui)(dui)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)進行壓縮和(he)放(fang)大(da)，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)更加穩(wen)(wen)定(ding)可靠。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)(hao)(hao)在弱電磁環境下(xia)也(ye)能(neng)(neng)(neng)(neng)(neng)保(bao)持較(jiao)(jiao)好(hao)的(de)(de)性能(neng)(neng)(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)具(ju)有(you)發(fa)射(she)功率小、抗(kang)(kang)千(qian)擾能(neng)(neng)(neng)(neng)(neng)力強(qiang)(qiang)(與有(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)比較(jiao)(jiao))和(he)抗(kang)(kang)電磁干擾能(neng)(neng)(neng)(neng)(neng)力強(qiang)(qiang)(與有(you)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)比較(jiao)(jiao))的(de)(de)特點。無(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)講(jiang)系統(tong)發(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)在發(fa)射(she)前和(he)發(fa)射(she)后均(jun)能(neng)(neng)(neng)(neng)(neng)保(bao)持良好(hao)的(de)(de)性能(neng)(neng)(neng)(neng)(neng)，使(shi)用過程中，發(fa)射(she)信(xin)(xin)號(hao)(hao)(hao)與接收信(xin)(xin)號(hao)(hao)(hao)完全不受任何千(qian)擾，可保(bao)持很好(hao)的(de)(de)穩(wen)(wen)定(ding)性，具(ju)有(you)良好(hao)的(de)(de)抗(kang)(kang)千(qian)擾性和(he)抗(kang)(kang)低頻干擾能(neng)(neng)(neng)(neng)(neng)力，即(ji)使(shi)在惡(e)劣(lie)的(de)(de)環境下(xia)也(ye)能(neng)(neng)(neng)(neng)(neng)保(bao)持較(jiao)(jiao)好(hao)的(de)(de)性能(neng)(neng)(neng)(neng)(neng)。因此無(wu)(wu)線(xian)(xian)(xian)系統(tong)有(you)較(jiao)(jiao)高(gao)的(de)(de)可靠性。

2.功耗小、不受(shou)天(tian)氣、濕度的(de)影(ying)響

無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系統在不(bu)同(tong)的(de)環(huan)境(jing)(jing)中，無(wu)線(xian)(xian)通(tong)(tong)信設備和有線(xian)(xian)通(tong)(tong)信設備一樣(yang)都要進行(xing)電能的(de)消耗。當(dang)環(huan)境(jing)(jing)溫度(du)在-40°C以下(xia)時(shi)(shi)，無(wu)線(xian)(xian)通(tong)(tong)信設備需要每(mei)天工作8小時(shi)(shi)左右;當(dang)環(huan)境(jing)(jing)溫度(du)為-20°C時(shi)(shi)，每(mei)天工作8小時(shi)(shi)左右;當(dang)環(huan)境(jing)(jing)溫度(du)為-30°C時(shi)(shi)，每(mei)天工作4小時(shi)(shi)左右。目前(qian)市場上常見(jian)的(de)無(wu)線(xian)(xian)對(dui)講(jiang)(jiang)系統有兩種(zhong)(zhong)電源輸(shu)入(ru)方(fang)式，一種(zhong)(zhong)是(shi)電源輸(shu)入(ru)，另(ling)一種(zhong)(zhong)是(shi)電源輸(shu)出。從這兩種(zhong)(zhong)方(fang)式對(dui)系統的(de)功(gong)耗來看，電源輸(shu)入(ru)方(fang)式的(de)功(gong)耗更大一些，但是(shi)功(gong)耗很小。并且(qie)設備的(de)工作環(huan)境(jing)(jing)不(bu)同(tong)，對(dui)電池的(de)需求量也不(bu)同(tong)，所以功(gong)耗也不(bu)同(tong)。

3信號不受干擾

在(zai)一(yi)(yi)(yi)些有(you)干(gan)擾的(de)(de)(de)地方，例如野外、機場、工廠等(deng)，一(yi)(yi)(yi)般采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)方式。分(fen)頻(pin)(pin)(pin)(pin)方式的(de)(de)(de)抗(kang)(kang)干(gan)擾能(neng)(neng)力(li)不強(qiang)(qiang)(qiang)，其抗(kang)(kang)干(gan)擾能(neng)(neng)力(li)主要取決于(yu)射(she)頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)大(da)小。分(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)功(gong)率一(yi)(yi)(yi)般是50dB在(zai)50dB左右時，其抗(kang)(kang)干(gan)擾能(neng)(neng)力(li)強(qiang)(qiang)(qiang)。但由(you)于(yu)分(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)干(gan)擾與(yu)噪(zao)聲(sheng)(主要是周邊噪(zao)聲(sheng))具有(you)很強(qiang)(qiang)(qiang)的(de)(de)(de)互通(tong)性，當分(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)超過50dB時，其抗(kang)(kang)千擾能(neng)(neng)力(li)就會減(jian)弱。另外，在(zai)一(yi)(yi)(yi)些有(you)噪(zao)音的(de)(de)(de)環(huan)境(jing)中(zhong)使用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，會使分(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)無(wu)法到達(da)發(fa)射(she)端的(de)(de)(de)接(jie)收機或者造(zao)成發(fa)射(she)端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收端信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)糟合而造(zao)成分(fen)頻(pin)(pin)(pin)(pin)或干(gan)擾(例如在(zai)使用(yong)(yong)(yong)(yong)室外電話時) 。而采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)的(de)(de)(de)無(wu)線(xian)對講(jiang)系(xi)統(tong)由(you)于(yu)發(fa)射(she)功(gong)率小，分(fen)頻(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)比有(you)線(xian)對講(jiang)系(xi)統(tong)高(gao)很多(在(zai)實(shi)際使用(yong)(yong)(yong)(yong)中(zhong)分(fen)頻(pin)(pin)(pin)(pin)設備一(yi)(yi)(yi)般可以將系(xi)統(tong)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)分(fen)頻(pin)(pin)(pin)(pin)到50dB以上),信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)不受(shou)干(gan)擾。如果采(cai)(cai)用(yong)(yong)(yong)(yong)分(fen)頻(pin)(pin)(pin)(pin)技(ji)(ji)術(shu)，需(xu)要在(zai)較大(da)的(de)(de)(de)回波功(gong)率下才能(neng)(neng)實(shi)現(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)的(de)(de)(de)分(fen)頻(pin)(pin)(pin)(pin)工作(zuo)(如分(fen)頻(pin)(pin)(pin)(pin)器(qi)發(fa)射(she)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)與(yu)接(jie)收信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)重疊時產生的(de)(de)(de)千擾)和發(fa)送信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)降(jiang)低(同(tong)(tong)頻(pin)(pin)(pin)(pin)帶內的(de)(de)(de)兩只天線(xian)對同(tong)(tong)一(yi)(yi)(yi)信(xin)(xin)(xin)(xin)道傳輸的(de)(de)(de)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)強(qiang)(qiang)(qiang)度(du)基(ji)本一(yi)(yi)(yi)致);如果采(cai)(cai)用(yong)(yong)(yong)(yong)混(hun)響技(ji)(ji)術(shu)，則可以實(shi)現(xian)對無(wu)線(xian)信(xin)(xin)(xin)(xin)號(hao)(hao)(hao)干(gan)擾的(de)(de)(de)抑制或降(jiang)低。